Reverse shift problem

SGBARRACUDA said
I'm not sure if this info will help you or not. But after Mopar got away from the Trunion output type mount in 1965, they went to the slip yoke but in 1966 and 1967 the 4 sp yoke was a smaller diameter. In 68 it was standardized.

You are referring to the U-joint size?

I am aware of the 7260/7290 differences. My original smogged '73 340 4-sp had the 7260 series front and back (slip yoke for transmission and pinion yoke for the 8 1/4 rear). I changed that to a 7290 series when I put in my 8 3/4 diff.

From Driveshaft Specialist of Texas website:

Note: A 7260 is 2 1/8 (2.125) in between the inner edges and a 7290 is 2 5/8 (2.622) in between the inner edges..

That notwithstanding different spline counts/sizes of the pinion yoke, same for the prop shaft on the transmission end.

Do I understand correctly that you are NOT referring to the prop shaft size, but indeed, the YOKE size?